GitHub is the world's most popular platform for version control and open‑source collaboration. It hosts over 180 million repositories, ranging from small personal projects to major enterprise software like Kubernetes and React. The core workflow revolves around Git, pull requests, and code reviews, making it easy for teams to contribute without stepping on each other's work.

Beyond basic hosting, GitHub provides GitHub Actions for CI/CD automation, a massive Marketplace with thousands of pre‑built integrations, and GitHub Copilot—an AI pair programmer that suggests code in real time. The free tier includes unlimited public/private repositories, making it an unbeatable starting point for solo developers and open‑source communities.